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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | ---
Beginning balance, shares at May. 31, 2012 |  | 362.6 |  |  |
Beginning balance at May. 31, 2012 | $ 1,604.5 | $ 3.6 | $ 561.1 | $ 1,002.1 | $ 37.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 569.0 |  |  | 569.0 |
Unrealized losses on securities, net of tax | (15.7) |  |  |  | (15.7)
Cash dividends declared | (476.7) |  |  | (476.7) |
Stock-based compensation | 22.9 |  | 22.9 |  |
Stock-based award transactions, Shares |  | 2.8 |  |  |
Stock-based award transactions, Value | 69.7 | $ 0.1 | 75.5 | (5.9) |
Ending balance, Shares at May. 31, 2013 |  | 365.4 |  |  |
Ending balance at May. 31, 2013 | 1,773.7 | $ 3.7 | 659.5 | 1,088.5 | 22.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 627.5 |  |  | 627.5 |
Unrealized losses on securities, net of tax | (0.5) |  |  |  | (0.5)
Cash dividends declared | (510.6) |  |  | (510.6) |
Repurchases of common shares, Shares |  | (6.2) |  |  |
Repurchase of common shares, Value | (249.7) | $ (0.1) | (11.2) | (238.4) |
Stock-based compensation | 26.4 |  | 26.4 |  |
Stock-based award transactions, Shares |  | 3.8 |  |  |
Stock-based award transactions, Value | $ 110.2 |  | 119.7 | (9.5) |
Ending balance, Shares at May. 31, 2014 | 363.0 | 363.0 |  |  |
Ending balance at May. 31, 2014 | $ 1,777.0 | $ 3.6 | 794.4 | 957.5 | 21.5
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 674.9 |  |  | 674.9 |
Unrealized losses on securities, net of tax | (14.0) |  |  |  | (14.0)
Cash dividends declared | (551.8) |  |  | (551.8) |
Repurchases of common shares, Shares |  | (3.9) |  |  |
Repurchase of common shares, Value | (182.4) |  | (7.2) | (175.2) |
Stock-based compensation | 31.5 |  | 31.5 |  |
Stock-based award transactions, Shares |  | 2.1 |  |  |
Stock-based award transactions, Value | $ 50.3 |  | 61.4 | (11.1) |
Ending balance, Shares at May. 31, 2015 | 361.2 | 361.2 |  |  |
Ending balance at May. 31, 2015 | $ 1,785.5 | $ 3.6 | $ 880.1 | $ 894.3 | $ 7.5

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